class_docstr: Keypoints class
  
  Parameters
  ----------
  pts : numpy.ndarray
      Key points as an numpy.ndarray in (x, y) format.
  height : int
      Height of the coordinate frame.
  width : int
      Width of the coordinate frame.
code: def __init__(self, pts=None, height=None, width=None):
      self.__data = pts
      self.__height = height
      self.__width = width
  
imports: import numpy
  import torch
  from solt.constants import ALLOWED_INTERPOLATIONS, ALLOWED_PADDINGS, ALLOWED_TYPES
  from solt.utils import validate_parameter
label_desc: Use image node_id 1 to create a new Keypoints object from inherited base classes: object with example: obj = Keypoints(pts, height, width)